Fields
- name: string
- table_oid: u32
- the table the column comes from; 0 for computed columns
- column_number: s16
- its attribute number in that table; 0 for computed columns
- type_oid: u32
- see
Oid - type_size: s16
- pg_type.typlen: negative for variable-length types
- type_modifier: s32
- pg_attribute.atttypmod: varchar(n), numeric(p, s), ...
- format: Format
- origin: string
- "table.column" when a typed query knows it (names decode errors); else empty